[R] analogue of group option of SAS MIXED/random in R

Bruno L. Giordano bruno.giordano at music.mcgill.ca
Mon Jul 3 23:56:58 CEST 2006

Dear list,

I am trying to use lme to build the analogue of the following SAS MIXED
random specification:

random int+Variable1+Variable2 /subject = Subject group=Condition type=vc;

which gives a Condition-blocked heterogeneity in the random effects
variance-covariance matrix.

Needless to say, I have a hard time in specifying Condition-specific
heterogeneities in the variance-covariance parameters.

I initially tried the following commands (without Condition-heterogeneity in
the random effects):


but have no idea about where to go from here (note that I don't want to nest 
Subject in Condition).



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